GB539308A - Improvements in translation devices for phonographs - Google Patents
Improvements in translation devices for phonographsInfo
- Publication number
- GB539308A GB539308A GB5100/40A GB510040A GB539308A GB 539308 A GB539308 A GB 539308A GB 5100/40 A GB5100/40 A GB 5100/40A GB 510040 A GB510040 A GB 510040A GB 539308 A GB539308 A GB 539308A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screws
- pole pieces
- unit
- fastened
- strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/16—Mounting or connecting stylus to transducer with or without damping means
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R11/00—Transducers of moving-armature or moving-core type
- H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
539,308. Phonographs. DICTAPHONE CORPORATION. March 19, 1940, No. 5100. Convention date, March 21, 1939. [Class 40 (ii)] [Also in Group XXXIX] In an electromechanical recorder or reproducer with a stylus for co-operating with a cylindrical hill-and-dale sound record, the pole pieces 36, Fig. 1 have a trough-shaped airgap in which moves a wedge-shaped armature 52 so that the flux increases more rapidly during the movement of the stylus towards the record and vice versa. This tends to correct errors occurring in hill- and-dale recording. This improvement is shown applied to a reproducer unit otherwise generally constructed as described in Specification 479,566, [Group XXXIX]. The armature 52 is a hollow triangular piece carrying the stylus 56 and attached by rivets to twisted spring tongues 50 projecting from a strip 47 fastened by screws 28 to an offset part 26 of a foundation plate 24. The armature is adjustably positioned and damped by a rubber padded leg 62 on a strip 58 adjustably secured to the pole pieces by screws 64 passing through slots 66 in the strip 58. The pole pieces 30, after the coils 44 have been slipped on to their S-shaped ends 34 are fastened to the plate 24 by screws 32. A permanent bar magnet 70 of "Nipermag" (Registered Trade Mark) is slipped in between the pole pieces and retained in place by its own magnetic attraction. This unit is inserted in a recess 16, Fig. 5, of a counterbalanced arm 8 pivoted at 20 on the carriage 2 of a dictating machine provided with a mandrel 12 for a cylindrical record 10. The unit is held in the recess by a lid 15 fastened by screws 17, 19, the screw 19 being screwed to a post 21 which passes through an eye lug 22 in the formation plate 24 of the unit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US263229A US2238863A (en) | 1939-03-21 | 1939-03-21 | Translation device for phonographs |
Publications (1)
Publication Number | Publication Date |
---|---|
GB539308A true GB539308A (en) | 1941-09-04 |
Family
ID=23000905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5100/40A Expired GB539308A (en) | 1939-03-21 | 1940-03-19 | Improvements in translation devices for phonographs |
Country Status (4)
Country | Link |
---|---|
US (1) | US2238863A (en) |
CH (1) | CH213942A (en) |
FR (1) | FR865011A (en) |
GB (1) | GB539308A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2508783A (en) * | 1945-02-16 | 1950-05-23 | Lionel B Cornwell | Electrical sound translating device |
US2485432A (en) * | 1945-11-28 | 1949-10-18 | Lionel B Cornwell | Magnetic phonograph pickup |
US2554696A (en) * | 1947-05-26 | 1951-05-29 | Henry H Bruderlin | Magnetic phonograph pickup head with two pairs of pole pieces |
US2496047A (en) * | 1947-06-18 | 1950-01-31 | Rca Corp | Art of recording and reproducing two-sided magnetic records |
-
1939
- 1939-03-21 US US263229A patent/US2238863A/en not_active Expired - Lifetime
-
1940
- 1940-03-19 GB GB5100/40A patent/GB539308A/en not_active Expired
- 1940-03-21 CH CH213942D patent/CH213942A/en unknown
- 1940-04-06 FR FR865011D patent/FR865011A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2238863A (en) | 1941-04-15 |
FR865011A (en) | 1941-05-12 |
CH213942A (en) | 1941-03-31 |
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